JPS6322841B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a heating evaporation method and a heating evaporation apparatus for the purpose of continuously evaporating insecticides, deodorizing agents, aromatic agents, etc. for any desired period of time. Conventionally, such a heating transpiration method, as typified by an electric mosquito repellent, involves placing an insecticidal evaporation plate made of a pulp board or the like holding an insecticidal ingredient on the hot plate of the electric mosquito repellent. A device that heats and evaporates the ingredients is used. However, in such a heating transpiration method, the effective time for each sheet is limited to about 10 hours, for example, and the uniformity of transpiration is poor. decreases. Furthermore, since the insecticidal component remains heated during the transpiration time, for example, 10 hours, it naturally undergoes thermal decomposition. In addition, it is very inconvenient that the evaporation plate must be replaced if it is used continuously for a long period of time. As an alternative, methods have been proposed that heat the insecticidal liquid itself from inside or outside the container, or that sucks up the insecticidal liquid with a porous wick and heats the porous wick, but none of these have been put into practical use. However, in the former case, the insecticidal liquid is in contact with the heat source for a long time, causing thermal decomposition, and there are also problems such as heating a large amount of chemicals in a preheated state in addition to the chemicals to be evaporated, which requires more heat than necessary. However, the latter has many drawbacks such as thermal decomposition of the chemical and accumulation of polymers in the heated evaporation part of the wick and clogging, which reduces the amount of insecticidal liquid sucked up and the amount of transpiration, and is still not in practical use. It has not been. In addition, in these transpiration methods, it is necessary to heat the entire transpiration plate for 10 hours, or to heat a large amount of chemicals or thick cores, so only a few
Electric mosquito traps that only evaporate kg/hour of insecticide require larger heaters than necessary and require a lot of electricity. The present invention has been made in order to solve the above-mentioned drawbacks, and involves sucking a liquid transpiration agent into a liquid suction capillary having a through hole in the center and indirectly heating the tip of the capillary. The present invention relates to a heating evaporation method and a heating evaporation method characterized in that the absorbed transpiration agent is continuously heated and evaporated. In other words, the chemical can be supplied to the transpiration section continuously and only in the amount necessary for transpiration, so it can be supplied naturally.
Compared to heating the drug all at once for 10 hours of transpiration, the transpiration surface is small and very little electricity is sufficient, making it possible to use dry batteries, for example.
This is a heating evaporation method that is very useful for use in places where there is no power source or for portable use. In the present invention, an electric heat source such as a nichrome wire, a sheet heater, or a heater using a semiconductor can be used as the heating element, but a positive temperature coefficient thermistor using a semiconductor is particularly advantageous due to its good temperature stability. . In the present invention, the liquid suction capillary having a through hole in the center (hereinafter simply referred to as "liquid suction capillary") includes:
It may be made of a material that does not deform or swell due to the transpiration agent used and is heat resistant to around 150°C, such as silicone resin, fluorine resin, glass, etc. If the amount of transpiration is too small with only the capillary cross section, it is also possible to provide a liquid-absorbing transpiration terminal at the tip of the capillary and heat the terminal indirectly. The inner diameter of the capillary is usually 0.5~
A diameter of 1 mm is used, but for transpiration agents that require only a small amount of transpiration, the inner diameter may be 0.5 mm or less. Furthermore, since there is a natural limit to the height at which the drug can climb up the capillary tube, it is necessary to take measures to reduce the difference in height between the inner bottom surface of the drug holding container and the tip of the capillary tube, depending on the inner diameter. It is. The liquid transpiration agent that can be used in the present invention is:
Various chemicals conventionally used for purposes such as pest control, sterilization, and fragrance can be used. Even if these various chemicals themselves are not liquid, they may be solvents such as paraffin hydrocarbons such as n-paraffin and isoparaffin, unsaturated aliphatic hydrocarbon alcohols, etc., which are practically non-toxic, odorless, and have little risk of fire. It is sufficient if it is dissolved in liquid and in liquid form. Insecticides such as pyrethroid (common name allethrin and its various and/or optical isomers), pyrethroids with a relatively high vapor pressure, repellents such as H,N-diethyl-mettatoluamide, cycloheximide, etc., fungicides such as Examples include salicylic acid, parachloro-meta-xylenol, and various flavoring agents such as lemon, rose, and green fragrances. Representative drugs include the following. Γ dl-3-allyl-2-methylcyclopentane-
2-en-4-one-1-yl dl-cis/trans-chrysanthemate (generic name: allethrin,
(Product name: Pinamine, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Pinamine) Γ dl-3-allyl-2-methylcyclopentane
2-en-4-one-1-yl d-cis/trans-chrysanthemate (trade name: Pinamin Fuorte, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Pinamin Fuorte) Γ d-3-allyl-2-methylcyclopenta-
2-en-4-one-1-yl d-trans-chrysanthemate (trade name: Exlin, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Exlin) Γ dl-3-allyl-2-methylcyclopenta-
2-en-4-on-1-yl d-trans-chrysanthemate (trade name: Bioallethrin, manufactured by Roussel-Huclav, hereinafter referred to as bioallethrin) In the present invention, the above-mentioned drug has a commonly used efficacy. Various additives such as enhancers, deodorants, fragrances, etc. can be optionally added. Efficacy enhancers include piperonyl butoxide, N-propylisome, cinepirin 222, cinepirin 500, Riesen 384, IBTA, S-421, etc., deodorants include lauric acid methacrylate (LMA), and fragrances. Examples include citral, citronellal, and neutradol. Hereinafter, the present invention will be explained in detail with reference to the drawings. Fig. 1 shows a sectional view of the apparatus of the present invention, and a container 1.
The tip 2 of the liquid suction capillary 2 passing through the lid 1-1 of
The container 1 is made up of a heater 3 for heating the container 1 and a heater receiving part 4-1 on the upper part of the support base 4, and the container 1 is used by putting a liquid transpiration agent 5 therein. . Further, the heater 3 is ring-shaped,
It has a structure that indirectly heats the tip 2-1 of the capillary tube 2. FIG. 2 is a cross-sectional view taken along line AA' in FIG. 1, and includes a cord 6 for energizing the heater 3 to generate heat. FIG. 3 shows another embodiment of the device of the present invention, in which the inner bottom surface 1-2 of the container 1 and the tip 2-1 of the liquid suction capillary tube 2 are shown.
The difference in height between the FIG. 4 shows still another embodiment of the device of the present invention,
The support base 4 has a container shape, and the tip 2 of the capillary tube 2
1 is provided with a liquid-absorbing transpiration terminal 7, and the transpiration agent is evaporated by indirectly heating the transpiration terminal 7. Experimental examples will be given below to explain the present invention in more detail. Experimental Example 1 This experiment was conducted using the apparatus of the present invention shown in FIG. The device used was a capillary tube 2 with an inner diameter of 0.6 mm.
Heater 3 is a ring-shaped PTC heater with an outer diameter of 1.6 mm and an inner surface temperature of 150°, with an inner diameter of 4 mm and a length of 5 mm. The transpiration agent has a boiling point of 150-300
8% pinamine and 5% each in aliphatic hydrocarbons at °C.
% Pinamine Forte, 3% Bioallethrin and 2% Exrin were dissolved and used. The weight of each device is measured every hour to determine the weight loss A (mg/hr). On the other hand, the evaporated gas is collected by suction into a column filled with silica gel, and the silica gel is extracted with chloroform every hour, concentrated, and quantitatively analyzed using a gas chromatograph to determine the amount of transpiration B (mg/hr) of the insecticide.
was determined, and the effective volatilization rate was measured using the following formula. Effective volatilization rate % of insecticidal agent=B/A×Concentration % of transpiration agent/100×100 The results are shown in Table 1.

[Table] As is clear from the above results, there is no need to replace the mat unlike with conventional electric mosquito repellent mats.
In addition, even with a heater surface area that is less than 1/10 of the heated area of pine (approximately 70 mm ² ), stable volatilization can be obtained continuously for a long time, and an extremely high volatilization rate can be maintained. It is an effective invention. Experimental Example 2 Instead of the liquid-absorbing capillary 2, a liquid-absorbing core made by tying together glass fibers with a string to a diameter of 1.6 mm was used as a transpiration agent with a boiling point of 240 to 270.
The same test as in Experimental Example 1 was repeated using a 4% pinamine forte solution diluted with an aliphatic hydrocarbon at ℃/760 mmHg (comparative test example). The results of determining the effective volatilization rate (%) are shown in Table 2 below.

[Table] From the above results, the excellent volatilization rate unique to the present invention cannot be achieved by using a liquid absorbent core made of glass fibers.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the device of the present invention, FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1, FIG. 3 is another device, and FIG. FIG. In the figure, 1 is a container, 2 is a liquid suction capillary, 3 is a heater, 4 is a support stand, 5 is a transpiration agent, and 6 is a cord.

Claims (1)

[Scope of Claims] 1. A liquid transpiration agent is absorbed by a liquid suction capillary having a through hole in the center, and the tip of the capillary is indirectly heated to continuously absorb the evaporation agent. A heating transpiration method characterized by heating and transpiring. 2. A container containing a liquid transpiration drug, a liquid suction capillary provided in the container and having a through hole in the center for sucking up the drug from inside the container, and an upper tip of the liquid suction capillary. A heating evaporation device characterized by being equipped with a heater for indirectly heating a part of the body.